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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <memory>
#include <optional>
#include <aidl/android/hardware/health/BnHealth.h>
#include <aidl/android/hardware/health/IHealthInfoCallback.h>
#include <android/binder_auto_utils.h>
#include <health-impl/HalHealthLoop.h>
#include <healthd/BatteryMonitor.h>
#include <healthd/healthd.h>
namespace aidl::android::hardware::health {
class LinkedCallback;
// AIDL version of android::hardware::health::V2_1::implementation::Health and BinderHealth.
// There's no need to separate the two in AIDL because AIDL does not support passthrough transport.
//
// Instead of inheriting from HalHealthLoop directly, implements the callback interface to
// HalHealthLoop instead.
//
// Sample implementation of health HAL.
class Health : public BnHealth, public HalHealthLoopCallback {
public:
// Initialize with |config|.
// A subclass may modify |config| before passing it to the parent constructor.
// See implementation of Health for code samples.
Health(std::string_view instance_name, std::unique_ptr<struct healthd_config>&& config);
virtual ~Health();
ndk::ScopedAStatus registerCallback(
const std::shared_ptr<IHealthInfoCallback>& callback) override;
ndk::ScopedAStatus unregisterCallback(
const std::shared_ptr<IHealthInfoCallback>& callback) override;
ndk::ScopedAStatus update() override;
// A subclass should not override this. Override UpdateHealthInfo instead.
ndk::ScopedAStatus getHealthInfo(HealthInfo* out) override final;
// A subclass is recommended to override the path in healthd_config in the constructor.
// Only override these if there are no suitable kernel interfaces to read these values.
ndk::ScopedAStatus getChargeCounterUah(int32_t* out) override;
ndk::ScopedAStatus getCurrentNowMicroamps(int32_t* out) override;
ndk::ScopedAStatus getCurrentAverageMicroamps(int32_t* out) override;
ndk::ScopedAStatus getCapacity(int32_t* out) override;
ndk::ScopedAStatus getChargeStatus(BatteryStatus* out) override;
// A subclass may either override these or provide function pointers in
// in healthd_config in the constructor.
// Prefer overriding these for efficiency.
ndk::ScopedAStatus getEnergyCounterNwh(int64_t* out) override;
// A subclass may override these for a specific device.
// The default implementations return nothing in |out|.
ndk::ScopedAStatus getDiskStats(std::vector<DiskStats>* out) override;
ndk::ScopedAStatus getStorageInfo(std::vector<StorageInfo>* out) override;
// A subclass may override these to provide a different implementation.
binder_status_t dump(int fd, const char** args, uint32_t num_args) override;
// HalHealthLoopCallback implementation.
void OnInit(HalHealthLoop* hal_health_loop, struct healthd_config* config) override;
void OnHealthInfoChanged(const HealthInfo& health_info) override;
// A subclass may override this if it wants to handle binder events differently.
virtual void BinderEvent(uint32_t epevents);
// A subclass may override this to determine whether screen should be kept on in charger mode.
// Default is to invoke healthd_config->screen_on() on the BatteryProperties converted
// from getHealthInfo.
// Prefer overriding these to providing screen_on in healthd_config in the constructor
// for efficiency.
virtual std::optional<bool> ShouldKeepScreenOn();
protected:
// A subclass can override this to modify any health info object before
// returning to clients. This is similar to healthd_board_battery_update().
// By default, it does nothing.
// See implementation of Health for code samples.
virtual void UpdateHealthInfo(HealthInfo* health_info);
private:
friend LinkedCallback; // for exposing death_recipient_
bool unregisterCallbackInternal(std::shared_ptr<IHealthInfoCallback> callback);
std::string instance_name_;
::android::BatteryMonitor battery_monitor_;
std::unique_ptr<struct healthd_config> healthd_config_;
ndk::ScopedAIBinder_DeathRecipient death_recipient_;
int binder_fd_ = -1;
std::mutex callbacks_lock_;
std::vector<std::unique_ptr<LinkedCallback>> callbacks_;
};
} // namespace aidl::android::hardware::health
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